Yeah, that would make sense. When I first started NB almost 2 years ago I had no problem falling asleep. It wasn't until last summer that I started having it. The only correlation on my test is that when my magnesium dropped to 2 it seemed to get worse. It's back up to 3 and my insomnia seems to be getting better. Last night I didn't fall asleep until midnight (which I hate) but at least I didn't wake up until 9.